The MorphOS development team is proud to announce the public release of MorphOS 3.4, which introduces faster R300 graphics drivers, improved video playback on G5-based systems, support for non-native display resolutions on various PowerBooks, screen blanker password protection, and numerous bug fixes and other improvements. For an overview of the included changes, please read our release notes.

Some serious improvements in there. Their market is probably small, but they release new versions at a relatively stable pace. One of the very few alternative operating systems that has managed to survive over the years where so many others fell.